Regulating bacterial dynamics by lime addition to enhance kitchen waste composting.

Xu, Z; Qi, C; Zhang, L; Ma, Y; Li, G; Nghiem, LD; Luo, W

Regulating bacterial dynamics by lime addition to enhance kitchen waste composting.

Xu, Z Qi, C Zhang, L Ma, Y Li, G Nghiem, LD Luo, W

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Bioresource Technology, 2021, 341, pp. 1-10
Issue Date:: 2021-12

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Field	Value	Language
dc.contributor.author	Xu, Z
dc.contributor.author	Qi, C
dc.contributor.author	Zhang, L
dc.contributor.author	Ma, Y
dc.contributor.author	Li, G
dc.contributor.author	Nghiem, LD
dc.contributor.author	Luo, W
dc.date.accessioned	2022-05-23T06:20:50Z
dc.date.available	2021-08-07
dc.date.available	2022-05-23T06:20:50Z
dc.date.issued	2021-12
dc.identifier.citation	Bioresource Technology, 2021, 341, pp. 1-10
dc.identifier.issn	0960-8524
dc.identifier.issn	1873-2976
dc.identifier.uri	http://hdl.handle.net/10453/157639
dc.description.abstract	This study examined bacterial dynamics in response to lime addition to enhance kitchen waste composting using modular network analysis. Bacterial communities could be separated into three meta-modules corresponding to the mesophilic, thermophilic, and mature stage of composting. Lime addition at 1% (wet weight) suppressed acidogens and denitrifiers (e.g. Lactobacillus and Acinetobacter) at the mesophilic stage to reduce greenhouse gas emissions. The matrix pH and temperature were also increased by lime addition via hydrogen reaction to favor bacterial growth and activity. Thus, thermophilic bacteria (e.g. Thermoactinomycetaceae and Planifilum) were enriched with lime addition to facilitate lignocellulose biodegradation for humus formation at the thermophilic stage. Further lime addition to 1.5% reduced ammonia emission at the thermophilic stage via chemical fixation. Moreover, lime inhibited denitrifiers but proliferated nitrifiers at the mature stage to decrease nitrous oxide emission and enhance nitrate content, respectively. As such, lime addition improved both biotic and abiotic composting performance.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Bioresource Technology
dc.relation.isbasedon	10.1016/j.biortech.2021.125749
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Biotechnology
dc.subject.mesh	Bacteria
dc.subject.mesh	Calcium Compounds
dc.subject.mesh	Composting
dc.subject.mesh	Oxides
dc.subject.mesh	Soil
dc.subject.mesh	Bacteria
dc.subject.mesh	Calcium Compounds
dc.subject.mesh	Composting
dc.subject.mesh	Oxides
dc.subject.mesh	Soil
dc.subject.mesh	Bacteria
dc.subject.mesh	Calcium Compounds
dc.subject.mesh	Oxides
dc.subject.mesh	Soil
dc.subject.mesh	Composting
dc.title	Regulating bacterial dynamics by lime addition to enhance kitchen waste composting.
dc.type	Journal Article
utslib.citation.volume	341
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
utslib.copyright.embargo	2023-12-01T00:00:00+1000Z
dc.date.updated	2022-05-23T06:20:49Z
pubs.publication-status	Published
pubs.volume	341

Abstract:

This study examined bacterial dynamics in response to lime addition to enhance kitchen waste composting using modular network analysis. Bacterial communities could be separated into three meta-modules corresponding to the mesophilic, thermophilic, and mature stage of composting. Lime addition at 1% (wet weight) suppressed acidogens and denitrifiers (e.g. Lactobacillus and Acinetobacter) at the mesophilic stage to reduce greenhouse gas emissions. The matrix pH and temperature were also increased by lime addition via hydrogen reaction to favor bacterial growth and activity. Thus, thermophilic bacteria (e.g. Thermoactinomycetaceae and Planifilum) were enriched with lime addition to facilitate lignocellulose biodegradation for humus formation at the thermophilic stage. Further lime addition to 1.5% reduced ammonia emission at the thermophilic stage via chemical fixation. Moreover, lime inhibited denitrifiers but proliferated nitrifiers at the mature stage to decrease nitrous oxide emission and enhance nitrate content, respectively. As such, lime addition improved both biotic and abiotic composting performance.

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http://hdl.handle.net/10453/157639